中文摘要：

滞流工况常发生在实际给水管网中，由于管道生物膜的存在，随着滞流时间加大，管网水质将趋于恶化，但是针对实际滞流管网，鲜有水质指标变化规律的相关研究。利用某城市管网上下游的2个中试点开展球墨铸铁管（NCI管）、聚乙烯管（P E管）的滞流对比实验，得到管网水质理化指标和活菌浓度的变化规律。研究结果表明：对于同一个中试点，在相同的滞时168 h内，PE管的水质余氯、浊度、溶解氧以及活菌浓度等指标都较大程度优于NCI管的水质相应指标。

英文摘要：

Stagnation usually happens in water distribution networks .Due to the existence of biofilm ,water quality will change when stagnation happens .However ,there is little research on the change of water quality in stagnation in actual water distribution net‐works .An experiment of stagnation has been carried out in actual nodular cast iron （NCI） pipe and polyethylene（PE） pipe in up‐stream and downstream pilot test point .The changes of physico-chemical factors and live bacteria concentration in stagnation has been obtained .The results show that when stagnation happens in 168 h at the same pilot test point ,the water quality in terms of re‐sidual chlorine ,dissolved oxygen ,turbidity and live bacteria concentration in PE pipe is better than the water quality in NCI pipe .